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Foreclosed Real Estate - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Real Estate Properties [Line Items]                    
Foreclosed real estate $ 466,000       $ 295,000       $ 466,000 $ 295,000
Charge-offs                 892,000 1,198,000
Provisions for loan losses 150,000 100,000 225,000 250,000 400,000 350,000 300,000 475,000 725,000 1,525,000
Gain (losses) realized from sale of foreclosed real estate                 31,000 68,000
Real estate taxes and other expenses of holding foreclosed real estate                 84,000 104,000
Foreclosed Real Estate
                   
Real Estate Properties [Line Items]                    
Charge-offs                 354,000 506,000
Provisions for loan losses                 20,000 0
Deferred gain from sale of real estate                 0 0
Deferred gains on the sale of foreclosed real estate $ 42,000       $ 43,000       $ 42,000 $ 43,000